content: /* Copyright (C) 2016-2018 Alibaba Group Holding Limited
  
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
  
      http://www.apache.org/licenses/LICENSE-2.0
  
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
  ==============================================================================*/
  
  /*
   * Protocol Buffers - Google's data interchange format
   * Copyright 2014 Google Inc.  All rights reserved.
   * https://developers.google.com/protocol-buffers/
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are
   * met:
   *
   *     * Redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer.
   *     * Redistributions in binary form must reproduce the above
   * copyright notice, this list of conditions and the following disclaimer
   * in the documentation and/or other materials provided with the
   * distribution.
   *     * Neither the name of Google Inc. nor the names of its
   * contributors may be used to endorse or promote products derived from
   * this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  package com.google.protobuf.jruby;
  
  import com.google.protobuf.DescriptorProtos;
  import com.google.protobuf.Descriptors;
  import org.jruby.*;
  import org.jruby.anno.JRubyClass;
  import org.jruby.anno.JRubyMethod;
  import org.jruby.runtime.*;
  import org.jruby.runtime.builtin.IRubyObject;
  
  import java.util.HashMap;
  import java.util.Map;
  
  @JRubyClass(name = "DescriptorPool")
  public class RubyDescriptorPool extends RubyObject {
      public static void createRubyDescriptorPool(Ruby runtime) {
          RubyModule protobuf = runtime.getClassFromPath("Google::Protobuf");
          RubyClass cDescriptorPool = protobuf.defineClassUnder("DescriptorPool", runtime.getObject(), new ObjectAllocator() {
              @Override
              public IRubyObject allocate(Ruby runtime, RubyClass klazz) {
                  return new RubyDescriptorPool(runtime, klazz);
              }
          });
  
          cDescriptorPool.defineAnnotatedMethods(RubyDescriptorPool.class);
          descriptorPool = (RubyDescriptorPool) cDescriptorPool.newInstance(runtime.getCurrentContext(), Block.NULL_BLOCK);
      }
  
      public RubyDescriptorPool(Ruby ruby, RubyClass klazz) {
          super(ruby, klazz);
      }
  
      @JRubyMethod
      public IRubyObject initialize(ThreadContext context) {
          this.symtab = new HashMap<IRubyObject, IRubyObject>();
          this.cBuilder = (RubyClass) context.runtime.getClassFromPath("Google::Protobuf::Builder");
          this.builder = DescriptorProtos.FileDescriptorProto.newBuilder();
          return this;
      }
  
      @JRubyMethod
      public IRubyObject build(ThreadContext context, Block block) {
          RubyBuilder ctx = (RubyBuilder) cBuilder.newInstance(context, Block.NULL_BLOCK);
          if (block.arity() == Arity.ONE_ARGUMENT) {
              block.yield(context, ctx);
          } else {
              Binding binding = block.getBinding();
              binding.setSelf(ctx);
              block.yieldSpecific(context);
          }
          ctx.finalizeToPool(context, this);
          buildFileDescriptor(context);
          return context.runtime.getNil();
      }
  
      @JRubyMethod
      public IRubyObject lookup(ThreadContext context, IRubyObject name) {
          IRubyObject descriptor = this.symtab.get(name);
          if (descriptor == null) {
              return context.runtime.getNil();
          }
          return descriptor;
      }
  
      /*
       * call-seq:
       *     DescriptorPool.generated_pool => descriptor_pool
       *
       * Class method that returns the global DescriptorPool. This is a singleton into
       * which generated-code message and enum types are registered. The user may also
       * register types in this pool for convenience so that they do not have to hold
       * a reference to a private pool instance.
       */
      @JRubyMethod(meta = true, name = "generated_pool")
      public static IRubyObject generatedPool(ThreadContext context, IRubyObject recv) {
          return descriptorPool;
      }
  
      protected void addToSymtab(ThreadContext context, RubyDescriptor def) {
          symtab.put(def.getName(context), def);
          this.builder.addMessageType(def.getBuilder());
      }
  
      protected void addToSymtab(ThreadContext context, RubyEnumDescriptor def) {
          symtab.put(def.getName(context), def);
          this.builder.addEnumType(def.getBuilder());
      }
  
      private void buildFileDescriptor(ThreadContext context) {
          Ruby runtime = context.runtime;
          try {
              this.builder.setSyntax("proto3");
              final Descriptors.FileDescriptor fileDescriptor = Descriptors.FileDescriptor.buildFrom(
                      this.builder.build(), new Descriptors.FileDescriptor[]{});
  
              for (Descriptors.EnumDescriptor enumDescriptor : fileDescriptor.getEnumTypes()) {
                  String enumName = Utils.unescapeIdentifier(enumDescriptor.getName());
                  if (enumDescriptor.findValueByNumber(0) == null) {
                      throw runtime.newTypeError("Enum definition " + enumName
                              + " does not contain a value for '0'");
                  }
                  ((RubyEnumDescriptor) symtab.get(runtime.newString(enumName)))
                          .setDescriptor(enumDescriptor);
              }
              for (Descriptors.Descriptor descriptor : fileDescriptor.getMessageTypes()) {
                  RubyDescriptor rubyDescriptor = ((RubyDescriptor)
                          symtab.get(runtime.newString(Utils.unescapeIdentifier(descriptor.getName()))));
                  for (Descriptors.FieldDescriptor fieldDescriptor : descriptor.getFields()) {
                      if (fieldDescriptor.isRequired()) {
                          throw runtime.newTypeError("Required fields are unsupported in proto3");
                      }
                      RubyFieldDescriptor rubyFieldDescriptor = rubyDescriptor.lookup(fieldDescriptor.getName());
                      rubyFieldDescriptor.setFieldDef(fieldDescriptor);
                      if (fieldDescriptor.getType() == Descriptors.FieldDescriptor.Type.MESSAGE) {
                          RubyDescriptor subType = (RubyDescriptor) lookup(context,
                                  runtime.newString(Utils.unescapeIdentifier(fieldDescriptor.getMessageType().getName())));
                          rubyFieldDescriptor.setSubType(subType);
                      }
                      if (fieldDescriptor.getType() == Descriptors.FieldDescriptor.Type.ENUM) {
                          RubyEnumDescriptor subType = (RubyEnumDescriptor) lookup(context,
                                  runtime.newString(Utils.unescapeIdentifier(fieldDescriptor.getEnumType().getName())));
                          rubyFieldDescriptor.setSubType(subType);
                      }
                  }
                  rubyDescriptor.setDescriptor(descriptor);
              }
          } catch (Descriptors.DescriptorValidationException e) {
              throw runtime.newRuntimeError(e.getMessage());
          }
      }
  
      private static RubyDescriptorPool descriptorPool;
  
      private RubyClass cBuilder;
      private Map<IRubyObject, IRubyObject> symtab;
      private DescriptorProtos.FileDescriptorProto.Builder builder;
  }
  